The Commodore 64 is an 8-bit home computer released by Commodore International in August, 1982, at a price of US$595. Preceded by the Commodore VIC-20 and Commodore MAX Machine, the C64 features 64 kilobytes (65,536 bytes) of RAM with sound and graphics performance that were superior to IBM-compatible computers of that timeDuring the Commodore 64's lifetime, sales totaled 30 million units, making it the best-selling single personal computer model of all time. For a substantial period of time (1983-1986), the Commodore 64 dominated the market with between 30% and 40% share and 2 million units sold per year, outselling the IBM PC clones, Apple computers, and Atari computers. The C128 was a significantly expanded successor to the C64 and unlike the earlier Plus/4 it remained compatible. The new machine featured 128 KB of RAM (externally expandable to 640 KB).The Commodore 128D was released in the fall of 1985 in Europe. The US release date was in the summer of 1986. It was an updated version of the C128 with a detached keyboard and a 1571 disk drive in the same box as the main system unit, providing a sleeker, more professional-looking appearance, much like that of a desktop PC